/**
* Create new query based on repository.
*
* @param string $conditions
* @return EntityCollection
*/
public function query($conditions = NULL)
{
$query = $this->repository->query($conditions);
// po vytvoreni noveho query je nutne kolekci vyprazdnit, prvky v kolekci obsazene by neodpovidali novemu query
$this->clear();
// je mozne opet loadovat
$this->setLoadable(true);
return $query;
}